/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package opennlp.maxent;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;

/**
 * This DataStream implementation will take care of reading a plain text file
 * and returning the Strings between each new line character, which is what
 * many Maxent applications need in order to create EventStreams.
 *
 * @author      Jason Baldridge
 * @version     $Revision: 1.2 $, $Date: 2010/09/06 08:02:18 $
 *
 */
public class PlainTextByLineDataStream implements DataStream {
    BufferedReader dataReader;
    String next;
    
    public PlainTextByLineDataStream (Reader dataSource) {
	dataReader = new BufferedReader(dataSource);
	try {
	    next = dataReader.readLine();
	}
	catch (IOException e) {
	    e.printStackTrace();
	}
    }
    
    public Object nextToken () {
	String current = next;
	try {
	    next = dataReader.readLine();
	}
	catch (Exception e) {
	    e.printStackTrace();
	}
	return current;
    }

    public boolean hasNext () {
	return next != null;
    }
 
}

